Device for retransporting a thread end of a take-up coil to the withdrawal tube of a rotor spinning machine

Abstract

A device for retransporting a thread end of a take-up coil to a withdrawal tube of a spinning machine, includes a two-armed suction tube with a suction nozzle, the suction tube being pivotally mounted and being formed with a bend in a plane wherein it is pivotable, the suction tube having a longitudinally extending slot formed on the inside of the bend for passage of a thread therethrough and into the suction tube under suction, the suction tube having a suction-air flow path extending from the suction nozzle at an end of one of the suction-tube arms through the one suction-tube arm and through the other of the suction-tube arms to the end of the other suction-tube arm and therefrom through an air guidance part to a union for a negative-pressure suction source.

I claim: 
     
       1. A device for retransporting a thread end of a take-up coil to a withdrawal tube of a rotor spinning machine, comprising a two-armed suction tube with a suction nozzle, said suction tube being pivotally mounted about an axis and being formed with a bend having an inside, said suction tube having a longitudinal slot formed on the inside of the bend extending through both suction-tube arms for passage of a thread therethrough and into said suction tube under suction, said suction tube having a suction-air flow path extending from said suction nozzle at an end of one of said suction-tube arms through said one suction-tube arm and through the other of said suction-tube arms to the end of said other suction-tube arm and therefrom through an air guidance part to a union for a negative-pressure suction source, said union having an axis which is coextensive with said pivot axis. 
     
     
       2. Device according to claim 1 wherein said pivot axis is intermediate the ends of said suction tube, and wherein said other of said suction-tube arms faces away from said suction nozzle and is divided in longitudinal direction thereof wherein said flow path on the inside of said bend of said longitudinally divided other of said suction-tube arms extends to the end of said other suction-tube arm, and said air guidance part constitutes the flow path on the outside of said bend of said longitudinally divided other of said suction-tube arms and leads to said union for said negative-pressure suction source. 
     
     
       3. Device according to claim 2, wherein the end of said other suction-tube arm conducts the thread to the withdrawal tube upon pivoting of said suction tube.